Would the "mumbled" communication between the MH370 crew and the Japan-bound B777, as the last reported contact, possibly indicate slow hypoxia?
Slow decompression leading to stealthy hypoxia seems by far, to me, the most likely event. Confused crew, gradually slipping into unconsciousness, make cockpit errors, turn off transponder accidentally, try to set return course, select wrong heading, along with incorrect reduced height setting - aircraft sets off flying steadily into the Indian Ocean until fuel exhaustion.
Many aviation people with extensive knowledge are emphatic that the transponder
must have been turned off by a deliberate action.
It just happens by pure coincidence that the course the disoriented crew set, is into an area not covered by any radar, and their flight over the Malay peninsula isn't picked up by the Malaysian military, or dismissed as a radar return of no consequence.
The denials by the Malaysians are in line with what they do actually know - but the Americans know vast amounts that the Malaysians (or Chinese) don't know - and the Americans are not about to tell anyone what they
do know.
One must keep in mind, it takes days to sort through logs, and decipher the right info from the vast amount of electronic noise.
Uncontrolled decompression - Wikipedia, the free encyclopedia